Liquid crystal compound - Patent 0425366

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EP 0 425 366 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	02.01.1992 Bulletin 1992/01

(43)	Date of publication A2:
	02.05.1991 Bulletin 1991/18

(21)	Application number: 90402979.0

(22)	Date of filing: 23.10.1990

(51)	International Patent Classification (IPC)⁵: C07C 69/84, C09K 19/20

(84)	Designated Contracting States:
	DE FR GB

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Priority:

27.10.1989 JP 281120/89

(71)	Applicant: Showa Shell Sekiyu Kabushiki Kaisha
	Tokyo (JP)

(72)	Inventors:
	Hagiwara, Takashi, c/o Showa Shell Sekiyu K.K. Chiyoda-ku, Tokyo 100 (JP) Yamakawa, Noriko, c/o Showa Shell Sekiyu K.K. Chiyoda-ku, Tokyo 100 (JP) Kawamura, Ichiro, c/o Showa Shell Sekiyu K.K. Chiyoda-ku, Tokyo 100 (JP)

(74)	Representative: Bourgognon, Jean-Marie et al
	Cabinet Flechner 22, Avenue de Friedland 75008 Paris 75008 Paris (FR)

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References cited: :

(54)	Liquid crystal compound

(57) A new tetrastable liquid crystal is provided which is useful for display and switching devices. The liquid crystal has the formula

where R₁ is a C₅₋₁₈ alkyl group and R₂ is a C₄₋₁₅ alkyl group and is an optically active center.